I don't think governments care about this like they do about using foreign exchange to export wealth.
If you have a pile of Fakeistan dollarydoos you wish to convert into USD, spending those dollarydoos in Fakeistan on electricity to apparate some Bitcoin, then converting those Bitcoin into USD in the USA does not create a foreign claim on Fakeistani economic output. On the other hand, directly exchanging your dollarydoos with foreigners for USD does leave those foreigners holding a pile of dollarydoos, which does represent a claim on future Fakeistani economic output.
If you have a pile of Fakeistan dollarydoos you wish to convert into USD, spending those dollarydoos in Fakeistan on electricity to apparate some Bitcoin, then converting those Bitcoin into USD in the USA does not create a foreign claim on Fakeistani economic output. On the other hand, directly exchanging your dollarydoos with foreigners for USD does leave those foreigners holding a pile of dollarydoos, which does represent a claim on future Fakeistani economic output.